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Microvascular Decompression: Salient Surgical Principles and Technical Nuances
Published on: July 5, 2011
Patterns of hearing loss after microvascular decompression for hemifacial spasm
1Department of Neurosurgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Gangnam-Gu, Seoul, Korea.
Journal of Neurology, Neurosurgery, and Psychiatry
|September 19, 2009
Summary
Microvascular decompression (MVD) for hemifacial spasm (HFS) rarely causes permanent hearing loss. Patients with cochlear-type hearing loss have a better prognosis than those with retrocochlear-type hearing loss or total deafness.
Area of Science:
- Neurosurgery
- Audiology
- Otolaryngology
Background:
- Hemifacial spasm (HFS) is a neurological disorder affecting facial muscles.
- Microvascular decompression (MVD) is a surgical treatment for HFS.
- Auditory function changes after MVD are a significant concern.
Purpose of the Study:
- To analyze audiological data following MVD for HFS.
- To compare postoperative hearing with preoperative hearing levels.
Main Methods:
- Studied auditory functions in 698 patients before and after MVD for HFS.
- Evaluated pure tone audiometry (PTA) and speech discrimination score (SDS).
Main Results:
- 95.7% of patients had no hearing loss immediately post-surgery.
- 2.4% experienced a decrease in PTA and SDS; 70.6% recovered hearing.
- 1.2% showed disproportionate SDS loss (suggesting nerve pathology), with poor recovery.
- 0.7% had total deafness, with no recovery.
Conclusions:
- Permanent hearing loss occurred in 2.2% of patients.
- Cochlear-type hearing loss shows a better prognosis than retrocochlear-type or total deafness.
- Total deafness post-MVD offers no chance of recovery to preoperative hearing status.
